10-5
10.6 Set Alarm Limits
CAUTION
In case that high pressure alarm limit of 60 cmH
2
O is not required under clinical
condition, setting high pressure alarm limit to 60 cmH
2
O or less is recommended so
as to extend the service life of the turbine and the battery.
NOTE
An alarm is triggered when the parameter value is higher than the high limit or
lower than the low limit.
When using the ventilator, always keep an eye on whether the alarm limits of a
specific parameter are set to the appropriate values.
Select [Alarm Setup] and then select [Limits 1] or [Limits 2] to set the alarm limits for Paw,
MV, ftotal, TVe, Tapnea, EtCO
2
, or FiO
2
(when the ventilator is connected to low-pressure
oxygen supply).
10.6.1 Auto Alarm Limits
Select [Alarm Setup]→[Limits 1→[Auto Alarm Limits], the ventilator will update the
parameter alarm limits based on the monitored value. The relationship is shown in the table
below.
Alarm Limit Adjust Formula
Paw High Limit Average peak pressure+10cmH2O or 35cmH2O, whichever is greater
MV High Limit 1.5×MV monitored value
MV Low Limit 0.6×MV monitored value
TVe High Limit 1.5×TVe average value
TVe Low Limit 0.5×TVe average value
ftot High Limit 1.4×ftot monitored value
Tapnea 15 s
The value used for average uses the monitoring value of the last eight ventilation cycles or
the monitoring value in one minute, whichever is smaller.
If the calculated alarm limit is more than the high threshold of setting range or less than the
low threshold, the corresponding threshold is used as the auto alarm limit.
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